Balance valve with buffering function

Abstract

The invention discloses a balance valve with a buffering function. The balance valve comprises a main valve body, a main valve element, a first valve seat, a second valve seat, a first elastic part, a second elastic part and a plug-in mounting valve body, wherein the first valve seat is fixedly arranged in the main valve body, the main valve element is matched with the first valve seat and the main valve body and divides the cavity of the main valve body into a first chamber, a second chamber and a control chamber, both the second valve seat and the second elastic part are arranged in the second chamber, and when oil enters a V-shaped oil port, the oil pushes the second valve seat and flows to a C-shaped oil port by a first through hole; the first elastic part is mounted in the plug-in mounting valve body which is fixedly connected with the main valve body, the first elastic part presses a steel ball to a flow channel port of a main flow channel in the main valve element through a spring seat, and when oil entering the C-shaped oil port pushes the main valve element to move in the direction of the compressed first elastic part, the oil at the C-shaped oil port can flow to the V-shaped oil port through a plurality of through holes of the main valve element. The balance valve with the buffering function is simple in processing, capable of accurately controlling the load running speed and long in service life.

Description

technical field [0001] The invention relates to the technical field of control valves, in particular to a balance valve with a buffer function capable of precisely controlling the speed of lowering a load. Background technique [0002] In modern construction machinery, construction machinery and other mechanical equipment, a large number of lifting hydraulic circuits are used. Among them, the balance valve is the key hydraulic component that controls the operation of the oil cylinder in the lifting circuit. The performance of the balance valve directly affects the performance of the main engine. The existing hydraulic balance valve generally has such a shortcoming: when the load is lowered, due to the characteristics of sudden changes in the flow area of ​​the valve port of the hydraulic balance valve, it will cause low-frequency jitter and impact on the load, resulting in system instability and affecting the overall performance. Machine safety and reliability. The patent p...

AI Technical Summary

Problems solved by technology

The existing hydraulic balance valve generally has such a shortcoming: when the load is lowered, due to the characteristics of sudden changes in the flow area of ​​the valve port of the hydraulic balance valve, it will cause low-frequency jitter and impact on the load, resulting in system instability and affecting the overall performance. Machine safety and reliability

[0003] (1) When the load is lowered and the load is raised, it passes through the same valve port, which will produce a throttling effect, but in practice, when the load rises, the throttling effect is not needed, which seriously affects the efficiency of the operation; in order to solve this problem, it is necessary to connect a valve in parallel. One-way valve, virtually increases the cost

[0004] (2) Milling grooves on the cone valve core, the processing is complicated and the efficiency is low, so the production cost is high

[0005] (3) When the load rises and falls, it passes through the same valve port, that is, the valve core and valve seat forming this valve port must be opened and closed once every time it rises and falls, which will cause the valve core or valve seat to use The frequency is too high, which reduces the service life

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